Retraction: Adjust your settings, too little retraction and you will have strings, too much and you will get blobs of filament when the print head starts its next segment of printing

Platform temperature: Room temperature

Print Speed: 10-30 mm/s. Due to the nature of flexible filament and the potential to buckle when being pushed through the hot end, it is highly recommended that you print at slow speeds. If you are still having difficulty consider printing yourself a filament guide as a modification to your printer. You can find printer mods on Thingiverse (see my collection and/or search with your printer name)